EP0269903B1 - Boîtier d'admission pour des machines à écoulement de fluide - Google Patents

Boîtier d'admission pour des machines à écoulement de fluide Download PDF

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Publication number
EP0269903B1
EP0269903B1 EP87116286A EP87116286A EP0269903B1 EP 0269903 B1 EP0269903 B1 EP 0269903B1 EP 87116286 A EP87116286 A EP 87116286A EP 87116286 A EP87116286 A EP 87116286A EP 0269903 B1 EP0269903 B1 EP 0269903B1
Authority
EP
European Patent Office
Prior art keywords
wall element
inlet housing
band
opening
connection port
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87116286A
Other languages
German (de)
English (en)
Other versions
EP0269903A3 (en
EP0269903A2 (fr
Inventor
Gerd Heinz Bauer
Armin Görisch
Herbert Hartmüller
Gerhard Meyer
Alexander Nicklas
Detlef Prokasky
Jürgen Schill
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KSB AG
Original Assignee
KSB AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by KSB AG filed Critical KSB AG
Priority to AT87116286T priority Critical patent/ATE72305T1/de
Publication of EP0269903A2 publication Critical patent/EP0269903A2/fr
Publication of EP0269903A3 publication Critical patent/EP0269903A3/de
Application granted granted Critical
Publication of EP0269903B1 publication Critical patent/EP0269903B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F04D29/4273—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps suction eyes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
    • F04D29/448—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps bladed diffusers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/10—Stators
    • F05B2240/12—Fluid guiding means, e.g. vanes
    • F05B2240/121—Baffles or ribs

Definitions

  • the invention relates to an inlet housing according to the preamble of the main claim.
  • the fluid supplied to the turbomachine is deflected by approximately 90 °, in order then to flow into an impeller of a first stage through a suction opening penetrated by a shaft.
  • a flow which is very uneven forms in the inlet cross section of the impeller and before the actual blading As a result, cavitation can occur in fluid-flow machines, which can damage or destroy the blade tips of the first impeller.
  • a multi-stage centrifugal pump is known from DE-B-21 58 518, which shows different inlet housings in FIGS. 6 and 7.
  • U-shaped or crescent-shaped wall surfaces are incorporated into the housing opposite the mouth of the connecting piece.
  • Three or four bores branch off from the mouth of the connecting piece, which open directly into the annular space and thus bring about an inflow extending over almost the entire width of the annular space.
  • swirls form within the annular space, which produce the known disadvantageous effects in the following impellers.
  • the vortex arranged on the bottom of the U-shaped wall elements facing the shaft creates two vortex braids. Due to the flow, these are drawn into the impeller and cause cavitation damage there.
  • the object of the invention is to develop an inlet housing for fluid-flow machines, to which the pumped medium flows almost radially to the shaft axis, which ensures a cavitation-reducing inflow for the downstream impeller with little complex production. This object is achieved in accordance with the characterizing part of the main claim.
  • the band-shaped wall element can be, for example, a correspondingly dimensioned metal strip which can be given its shape in the simplest way, which ensures an optimal flow distribution between the mouth of the connecting piece and the inlet cross section of the downstream impeller within the inlet housing.
  • An embodiment of the invention provides that the band-shaped wall element is connected to a housing wall of a first stage, that it forms the outer wall of the inlet housing and that an end plate which is tightly attached to the band-shaped wall element closes the inlet housing.
  • the band-shaped wall element can simultaneously form the outer wall of the inlet housing.
  • the connecting piece is then attached in the tapered part of the oval surface and a correspondingly designed end plate, which can be provided with bearings for the shaft, forms a tight seal for the inlet housing.
  • a further embodiment of the invention provides that the ends of the band-shaped wall element arranged in the area of the connecting piece mouth enclose an angle which is open to the shaft and is equal to or greater than 10 °. This measure ensures that the medium emerging from the mouth of the connecting piece is supplied to the suction opening almost without turbulence.
  • a further embodiment of the invention provides that the band-shaped wall element wrapping around the suction opening is provided with one or more radii of curvature, the center or centers of which are arranged concentrically or eccentrically to the shaft axis, with an eccentric center position there being an offset in the direction of the connecting piece. This measure allows good flow guidance in the area which is exactly opposite the junction of the connecting piece and is covered by the shaft.
  • a further embodiment of the invention provides in this connection that the radius of curvature of the band-shaped wall element in the area of the suction opening is made 1.2 to 1.8 times larger than the radius of the suction opening. Experiments have shown that with such a ratio of the radii the most favorable inflow conditions and thus conditions preventing cavitation are present.
  • the axial extent of the band-shaped wall element is designed to be equal to or larger than the mouth of the connecting piece.
  • the oval-shaped surface enveloped by the wall element thus has a height which corresponds approximately to the diameter of the connecting piece. It is easily possible to expand the confluence of the connection piece in the direction of the shaft in a streamlined manner. In this way, detachments forming swirls are prevented in the area of the junction opening.
  • the design according to the invention likewise requires simple manufacture, according to which the flow-guiding band-shaped wall element is arranged within an annular space surrounding the suction opening.
  • the flow-guiding band-shaped wall element is arranged within an annular space surrounding the suction opening.
  • Another measure which serves to optimize the inflow provides that the suction opening and / or the band-shaped wall element located in the region of the suction opening is provided with flow-guiding means.
  • This can be flow-optimized shaped inlet rings which ensure a swirl-free deflection in the area of the wheel inlet.
  • an open inlet housing (1) is shown using the example of a centrifugal pump, in the interior of which a wall element (2) is arranged. It is designed in the form of a band, its ends (3, 4) being arranged on both sides of the mouth (5) of the connecting piece (6) and completely wrapping around the suction opening (7) through which the medium to be conveyed flows to an impeller downstream of the inlet housing.
  • the wall element (2) closes an oval-shaped one that becomes larger towards the suction opening (7) Area.
  • a flow guide plate (8) arranged between the mouth (5) and the suction opening (7) ensures good flow guidance.
  • the radius of curvature (R2) of the wall element is larger than the radius (R1) of the suction opening and in this example is arranged offset eccentrically in the direction of the connecting piece (6) relative to the center of the suction opening.
  • the wall element (2) is arranged within an easily producible annular space (9) and by known means, e.g. Welding, screwing and the like, fixed within the same. Starting from the junction (5), the wall element (2) has an opening angle ( ⁇ ) which ensures a constant flow.
  • the inlet housing (1) has a flange ring (10) which serves as an abutment for the screws holding the centrifugal pump together.
  • Fig. 2 shows an assembled inlet housing (2) on a multi-stage centrifugal pump (11).
  • a shaft (12) is passed through the inlet housing and supported in a bearing (13).
  • the medium flowing in through the connecting piece (6) reaches the actual space with the oval-shaped base area, which is enveloped by the wall element (2).
  • the direct arrangement of the ends of the wall element in the region of the junction (5) creates a safe flow.
  • the flow follows the wall surfaces of the wall element and reaches the suction opening (7) with an impeller located behind it. As a result of the flow guidance avoiding turbulence, very good inflow conditions result for a downstream impeller.
  • FIG. 3 an embodiment is shown using the example of a single-stage pump, in which the wall element (2) simultaneously represents a medium-tight outer wall of the Eirlaufgephaseuses.
  • the wall element (2) enveloping the oval-shaped surface is welded to the pump housing and closed by a cover (14) having a corresponding outer contour.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • External Artificial Organs (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Claims (9)

  1. Corps d'entrée pour turbomachines à un ou plusieurs étages dans lequel le fluide arrive par un tube de raccordement placé en position radiale par rapport à l'arbre, dans lequel le tube de raccordement débouche dans un espace enveloppant l'arbre et présentant une paroi de direction de l'écoulement et dans lequel un élément de paroi en forme d'arc, ouvert vers le tube de raccordement et recouvrant l'arbre et une ouverture d'aspiration l'entourant est placé dans cet espace, caractérisé en ce que
    - l'élément de paroi (2) a la forme d'un ruban et qu'il entoure une surface ovale,
    - les extrêmités (3, 4) de l'élément de paroi (2) sont disposées des deux côtés de l'embouchure (5) du tube de raccordement (6) et
    - que la partie de l'élément de paroi (2) en forme de ruban qui possède un grand rayon est placée au bord et autour de l'ouverture d'aspiration (7).
  2. Corps d'entrée selon la revendication 1 caractérisé en ce que l'élément de paroi (2) en forme de ruban est relié à la paroi d'un corps d'un premier étage, qu'il forme la paroi externe du corps d'entrée et qu'une plaque d'obturation (14) placée étroitement sur l'élément de paroi (2) en forme de ruban ferme le corps d'entrée.
  3. Corps d'entrée selon les revendications 1 ou 2 caractérisé en ce que les extrêmités (3, 4) de l'élément de paroi (2) en forme de ruban placées dans la zone de l'embouchure (5) du tube de raccordement englobent un angle (α) ouvert du côté de l'arbre (12) et égal ou supérieur à 10°.
  4. Corps d'entrée selon les revendications 1 à 3 caractérisé en ce que l'élément de paroi (2) en forme de ruban qui entoure l'ouverture d'aspiration (7) présente un ou plusieurs rayons de courbure (R2) dont le ou les centres sont placés de manière concentrique ou excentrique par rapport à l'axe de l'arbre et que, dans le cas où les centres sont placés de manière excentrique leur position est désaxée vers le tube de raccordement (6).
  5. Corps d'entrée selon les revendications 1 à 4 caractérisé en ce que le rayon (R2) de l'élément de paroi (2) en forme de ruban est, dans la zone de l'ouverture d'aspiration (7) 1,2 à 1,8 fois plus grand que le rayon (R1) de l'ouverture d'aspiration (7).
  6. Corps d'entrée selon les revendications 1 à 5 caractérisé en ce que l'étendue axiale de l'élément de paroi (2) en forme de ruban est égale ou plus grande que l'embouchure (5) du tube de raccordement (6).
  7. Corps d'entrée selon une ou plusieurs des revendications 1 à 6 caractérisé en ce que une ou plusieurs tôles-guides (8) du fluide sont placées à l'intérieur de la surface ovale entre l'embouchure (5) du tube de raccordement (6) et l'ouverture d'aspiration (7).
  8. Corps d'entrée selon une ou plusieurs des revendications 1 à 7 caractérisé en ce que l'élément de paroi (2) de guidage du fluide et en forme de ruban est placé à l'intérieur d'un espace annulaire (9) entourant l'ouverture d'aspiration (7).
  9. Corps d'entrée selon une ou plusieurs des revendications 1 à 8 caractérisé en ce que l'ouverture d'aspiration (7) et/ou l'élément de paroi (2) en forme de ruban placé dans la zone de l'ouverture d'aspiration (7) est équipée de moyens de guidage du fluide.
EP87116286A 1986-11-29 1987-11-05 Boîtier d'admission pour des machines à écoulement de fluide Expired - Lifetime EP0269903B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87116286T ATE72305T1 (de) 1986-11-29 1987-11-05 Einlaufgehaeuse fuer stroemungsmaschinen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3640894 1986-11-29
DE3640894A DE3640894C2 (de) 1986-11-29 1986-11-29 Einlaufgehäuse für Kreiselpumpe

Publications (3)

Publication Number Publication Date
EP0269903A2 EP0269903A2 (fr) 1988-06-08
EP0269903A3 EP0269903A3 (en) 1989-07-26
EP0269903B1 true EP0269903B1 (fr) 1992-01-29

Family

ID=6315134

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87116286A Expired - Lifetime EP0269903B1 (fr) 1986-11-29 1987-11-05 Boîtier d'admission pour des machines à écoulement de fluide

Country Status (4)

Country Link
US (1) US4799857A (fr)
EP (1) EP0269903B1 (fr)
AT (1) ATE72305T1 (fr)
DE (1) DE3640894C2 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991015664A1 (fr) * 1990-03-30 1991-10-17 Airflow Research And Manufacturing Corporation Soufflante centrifuge compacte
US5125806A (en) * 1990-06-18 1992-06-30 Sundstrand Corporation Integrated variable speed compressor drive system
US5297930A (en) * 1991-12-31 1994-03-29 Cornell Research Foundation, Inc. Rotating stall suppression
DE4222391C2 (de) * 1992-07-08 1995-04-20 Gutehoffnungshuette Man Zylindrisches Brennkammergehäuse einer Gasturbine
DE4328186C2 (de) * 1992-10-26 2002-05-16 Alstom Strömungsteiler für radial-axiale Eintrittsgehäuse
DE4326800A1 (de) * 1993-08-10 1995-02-16 Abb Management Ag Vorrichtung zur Einstellung einer stabilen Verdichterzuströmung aus dem Einlaufkasten in Gasturbingenanlagen
CN102444617A (zh) * 2010-09-30 2012-05-09 上海凯士比泵有限公司 多级离心泵的吸水室
CN102454637A (zh) * 2010-10-20 2012-05-16 李正奇 高温高压离心泵用进水段
DE102011116904A1 (de) * 2011-10-25 2013-04-25 Wilo Se Mehrstufige Kreiselpumpe

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Publication number Priority date Publication date Assignee Title
DE178666C (fr) *
DE15855C (de) * B. VERITV und W. VERITY in London Neuerungen an Ventilatoren
DE664629C (de) * 1938-08-31 Karl Loebler Kreiselpumpe
US2018827A (en) * 1933-04-15 1935-10-29 Allis Chalmers Mfg Co Rotary blower casing
US2542902A (en) * 1946-01-31 1951-02-20 Ford Motor Co Water pump
CH313025A (de) * 1951-09-13 1956-03-15 Andritz Ag Maschf Kreiselpumpengehäuse
GB1013341A (en) * 1961-02-02 1965-12-15 Tetmark Patents Ltd Improvements in volute pumps, turbines and the like
DE1503270A1 (de) * 1965-06-24 1970-07-16 Fischachtaler Maschb Gmbh Einlaufgehaeuse fuer Stroemungsmaschinen
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DE1528883A1 (de) * 1966-07-15 1971-06-03 Voith Gmbh J M Saugkruemmer fuer Kreiselpumpen
DE1628193A1 (de) * 1966-12-15 1970-04-30 Bahco Ab Sauggehaeuse fuer Radialgeblaese
GB1184972A (en) * 1968-01-02 1970-03-18 Pegg S & Son Ltd Reversible Impeller Pump
DE1653786B2 (de) * 1968-02-15 1972-03-02 J M Voith GmbH, 7920 Heidenheim Saugkruemmer fuer kreiselpumpen
CA957563A (en) * 1970-12-21 1974-11-12 Carl J. Blom Multistage pump and manufacturing method
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JPH0643840B2 (ja) * 1985-10-04 1994-06-08 株式会社日立製作所 予旋回形ポンプ吸込流路

Also Published As

Publication number Publication date
ATE72305T1 (de) 1992-02-15
EP0269903A3 (en) 1989-07-26
DE3640894C2 (de) 1997-05-28
US4799857A (en) 1989-01-24
DE3640894A1 (de) 1988-06-09
EP0269903A2 (fr) 1988-06-08

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